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Employee and Agent Benefits - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Plan actuarial gain and loss amortization disclosures |  |  |
Allowable corridor not used for amortization of actuarial gains and losses of qualified pension plan (as a percent) | 10.00% |  |
Pension benefits |  |  |
Components of Net Periodic Benefit Cost (Income) |  |  |
Service cost | $ 59.2 | $ 55.6 | $ 78.4
Interest cost | $ 161.5 | $ 160.1 | $ 112.8
Interest cost, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
Expected return on plan assets | $ (170.4) | $ (163.2) | $ (178.9)
Expected return on plan assets, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
Amortization of prior service (benefit) cost | $ (16.7) | $ (16.8) | $ (16.8)
Amortization of prior service (benefit) cost, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
Recognized net actuarial (gain) loss | $ 39.0 | $ 41.0 | $ 55.7
Recognized net actuarial (gain) loss, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
Settlement | $ 0.2 |  |
Settlement, location on consolidated statements of operations | Operating expenses |  |
Net periodic benefit cost (income) | $ 72.8 | $ 76.7 | $ 51.2
Other changes recognized in accumulated other comprehensive (income) loss |  |  |
Net actuarial (gain) loss | (14.5) | 24.4 |
Amortization of gain (loss) | (39.0) | (41.0) |
Amortization of prior service benefit (cost) | 16.7 | 16.8 |
Settlement | (0.2) |  |
Total recognized in pre-tax accumulated other comprehensive (income) loss | (37.0) | 0.2 |
Total recognized in net periodic benefit cost and pre-tax accumulated other comprehensive (income) loss | 35.8 | 76.9 |
Other postretirement benefits |  |  |
Components of Net Periodic Benefit Cost (Income) |  |  |
Interest cost | $ 3.2 | $ 3.4 | $ 2.3
Interest cost, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
Expected return on plan assets | $ (4.5) | $ (4.6) | $ (4.9)
Expected return on plan assets, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
Amortization of prior service (benefit) cost | $ (1.1) | $ (0.8) | $ (1.1)
Amortization of prior service (benefit) cost, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
Recognized net actuarial (gain) loss | $ (0.9) | $ (1.0) | $ (1.1)
Recognized net actuarial (gain) loss, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
Net periodic benefit cost (income) | $ (3.3) | $ (3.0) | $ (4.8)
Other changes recognized in accumulated other comprehensive (income) loss |  |  |
Net actuarial (gain) loss | (6.4) | (5.2) |
Amortization of gain (loss) | 0.9 | 1.0 |
Amortization of prior service benefit (cost) | 1.1 | 0.8 |
Total recognized in pre-tax accumulated other comprehensive (income) loss | (4.4) | (3.4) |
Total recognized in net periodic benefit cost and pre-tax accumulated other comprehensive (income) loss | $ (7.7) | $ (6.4) |

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